How to Fix Render-Blocking Resources and Reduce LCP Without Breaking Site Layout?

After running a PageSpeed Insights test, I found some key issues:
Eliminate render-blocking resources Reduce unused JavaScript Largest Contentful Paint (LCP) around 2730msDuplicate modules in JavaScript bundles
My question is:
What's the best way to fix render-blocking issues without breaking the site?
How can I realistically reduce LCP under 2 seconds for a landing page?
Any tools or methods you recommend to deal with unused JavaScript effectively?
Would love to hear any advice or experiences from you guys. Thanks a lot!

To fix render-blocking issues without breaking your site:

1. Use async/defer attributes for non-critical scripts
2. Inline critical CSS and load non-critical CSS asynchronously
3. Implement preload for essential resources

For reducing LCP under 2 seconds:

1. Optimize and compress images (consider WebP format)
2. Implement proper image sizing and responsive images
3. Use a CDN for faster content delivery
4. Consider server-side rendering for critical content
5. Prioritize above-the-fold content loading

For handling unused JavaScript:

1. Use code splitting with webpack or Rollup
2. Implement tree shaking in your build process
3. Consider tools like BundleAnalyzer to visualize bundle size
4. Load third-party scripts on demand rather than upfront

Quick wins would be implementing proper image optimization, moving non-critical JS to load after page render, and using resource hints like preconnect for external domains. These changes typically provide significant performance improvements without major site restructuring.